Question

Van Arkel's method of purification of metals involves converting the metal to a ______.

Options

• volatile stable compound

• volatile unstable compound

• non-volatile stable compound

• None of the above

Answer 1

Van Arkel's method of purification of metals involves converting the metal to a volatile stable compound.

Explanation:

This method is very useful for removing all of the oxygen and nitrogen presents as impurities in certain metals such as Zr and Ti.

\[\ce{Ti + 2I2 ->[523 K] \underset{Volatile stable compound}{TiI4} ->[1700 K] \underset{Pure metal}{Ti} + 2I2}\]